To solve the inequality \( \frac{x}{13} < \frac{4}{5} \), follow these steps:
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Multiply both sides of the inequality by 13 to eliminate the fraction (Make sure to note that multiplying by a positive number doesn't change the direction of the inequality):
\[ x < 13 \cdot \frac{4}{5} \]
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Now calculate \( 13 \cdot \frac{4}{5} \):
\[ 13 \cdot \frac{4}{5} = \frac{52}{5} \]
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Therefore, your inequality simplifies to:
\[ x < \frac{52}{5} \]
So the solution is:
x < 52/5.